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 A curated list of awesome mathematics resources.
 
-## Learning platforms
+## Foundations of mathematics
+
+### Set theory
+
+* [Set Theory on the Stanford Encyclopedia of Philosophy](http://plato.stanford.edu/entries/set-theory/)
+* [An introduction to set theory](http://www.math.toronto.edu/weiss/set_theory.pdf) - William A. R. Weiss
+* [Set Theory and Foundations of Mathematics](http://www.settheory.net/) - Sylvain Poirier
+* [Set Theory on Wikibooks](https://en.wikibooks.org/wiki/Set_Theory)
+
+### Logic
+
+* [Language, proof, and logic](http://ssdi.di.fct.unl.pt/~pb/cadeiras/lc/0102/lpl%20textbook.pdf) - Jon Barwise, John Etchemendy
+* [Introduction to logic](http://logic.stanford.edu/intrologic/chapters/cover.html) - Michael Genesereth, Eric Kao (Stanford University)
+* [A problem course in mathematical logic](http://euclid.trentu.ca/math/sb/pcml/pcml-16.pdf) - Stefan Bilaniuk (Trent University)
+* [An introduction to formal logic](https://textbookequity.org/oct/Textbooks/Magnus_forallx.pdf) - P.D. Magnus (University at Albany)
+* [Formal logic](http://maude.sip.ucm.es/~miguelpt/papers/flogic.pdf) - Miguel Palomino
+* [Mathematical logic](http://www.mathematik.uni-muenchen.de/~schwicht/lectures/logic/ws03/ml.pdf) - Helmut Schwichtenberg
+* [Mathematical logic](http://www.personal.psu.edu/t20/notes/logic.pdf) - Stephen G. Simpson (Pennsylvania State University)
+
+## Arithmetic
+
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+## Algebra
+
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+## Analysis
+
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+## Combinatorics
+
+* []()
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+## Geometry and topology
+
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+## Probability and statistics
+
+* []()
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+## Numerical Analysis
+
+* []()
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+## Computer algebra
+
+* []()
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+
+
+## Websites
+
+### Learning platforms
 
 * [Khan Academy](https://www.khanacademy.org/math)
 * [Coursera](https://www.coursera.org/courses?query=mathematics&languages=en)
 * [Wikibooks](https://en.wikibooks.org/wiki/Wikibooks:Mathematics_bookshelf)
-* [MathOverflow](http://mathoverflow.net/)
 
-## Foundations of mathematics
+### Questions and answers
 
-* []()
+* [Mathematics Stack Exchange](http://math.stackexchange.com/)
+* [MathOverflow](http://mathoverflow.net/) - for professional mathematicians
 
-## Arithmetic
+### Encyclopedia
 
-## Algebra
+* [Encyclopedia of Mathematics](https://www.encyclopediaofmath.org)
+* [Wolfram Mathworld](http://mathworld.wolfram.com/)
+* [Planetmath](http://planetmath.org/)
 
-## Analysis
+### Misc
 
-## Combinatorics
-
-## Geometry and topology
-
-## Probability and statistics
-
-## Numerical Analysis
-
-## Computer algebra
+* [Areas of mathematics on Wikipedia](https://en.wikipedia.org/wiki/Areas_of_mathematics)